| PROPOSAL NUMBER: | 02- A2.04-9271 (For NASA Use Only - Chron: 022728 ) |
| SUBTOPIC TITLE: | Airframe Systems Noise Prediction and Reduction |
| PROPOSAL TITLE: | Development of High Frequency Excitation Devices for Noise Reduction |
SMALL BUSINESS CONCERN
(Firm Name, Mail Address, City/State/Zip, Phone)
INNOVATIVE TECHNOLOGY APPLICATIONS CO.
P.O. Box 6971
Chesterfield , MO 63006 - 6971
(314 ) 576 - 1639
PRINCIPAL INVESTIGATOR/PROJECT MANAGER
(Name, E-mail, Mail Address, City/State/Zip, Phone)
Alan Cain
ITACabc@aol.com
P.O. Box 6971
Chesterfield , MO 63006 - 6971
(314 ) 576 - 1639
TECHNICAL ABSTRACT (LIMIT 200 WORDS)
The noise level of new and existing aircraft need to be reduced to meet the increasingly stringent US and international airport standards. High frequency excitation (wavelengths much shorter that amplified instabilities) of jet flows is a new technology that has the potential to reduce acoustic levels significantly in addition to lowering turbulence levels. In application, forcing is applied at frequencies that are much higher than ones associated with the large-scale, two-dimensional structures associated with the jet, but much lower than the Kolmogorov scale. The development of the jet is substantially altered through two mechanisms. First, the high-frequency forcing increases the turbulent dissipation rate. Second, it reduces the turbulent production. These two mechanisms together lead to a significant decrease in the energy in the large-scale two-dimensional motion and subsequently lowering turbulent and noise levels. One benefit of the control is that the forcing needs only to possess frequencies that are above a certain range. This single frequency requirement encompasses a wide array of potentially suitable devices.
POTENTIAL COMMERCIAL APPLICATIONS (LIMIT 150 WORDS)
The engine retrofitting and new engine development market for meeting stage IV requirements for commercial aircraft is in the order of billions of dollars for the next 10 and 20 years. Phase II flight tests will guide the implementation of such systems on commercial jet engines. The experiments will be combined with scaling analysis to develop guidance for optimal system hardware designs that can be patented. These designs are of great values to aircraft and engine manufacturers.
POTENTIAL NASA APPLICATIONS (LIMIT 150 WORDS)
The proposed technology development could open the door to further understanding and breakthroughs (beyond the proposed SBIR program) by NASA researchers. These breakthroughs in noise reduction may advance the national interest in a quieter air travel industry.